Libertarianism is based on the idea that “In theory, everyone is basically good and if left to their own devices, they will resort to doing good”. In the Libertarian world, you could put a prison half-way house for sex offenders next to an elementary school.
I remember a Libertarian telling me that they supported no-fault easy divorce because “that way, no one gets hurt”. A rather typical mindset.
Nannytarianism is based on the idea that people have no Savior and need a human government to order their lives.